Perfect the casually dapper look in a black gilet and black jeans. A pair of dark brown leather work boots immediately kicks up the style factor of your ensemble. In the colder months, when warmth is above all, it can be easy to surrender to a less-than-stylish look. But this look is a good illustration that you can actually stay warm and remain stylish at the same time in the colder months. Perfect if you're hunting for some seriously inspiring casual style for men in their thirties.